摘要
钢筋混凝土框架结构的梁柱节点对结构抗震力学性能具有显著的影响。基于刚性节点假定和宏观柔性模型的节点模拟方式,一直缺乏有关其适用范围的研究。地震易损性分析方法的引入,能够从概率意义上定量地刻画这两种节点模型对钢筋混凝土框架结构抗震力学性能的影响,获得的结论可望为钢筋混凝土框架结构梁柱节点的处理提供理论的依据与支撑。因此,该文基于Open Sees平台,考虑地震动输入的随机性,通过采用双频率段控制选波方法,并采用增量动力分析理论,定义4个不同的抗震性能水准,对三榀不同层数的钢筋混凝土框架结构分别采用刚性节点假定和宏观柔性模型进行了地震易损性研究。获得的结论表明:基于我国抗震规范设计的钢筋混凝土框架结构,在多遇地震作用下,采用刚性节点假定对结构进行抗震性能评估是合理的,否则需要考虑梁柱节点变形对整个框架结构抗震性能的影响。
Beam-column joints have considerable influence on the seismic mechanical performance of reinforced concrete frame structures. There has been a lack of investigation in the application scope of joint simulation based on the rigid joint assumption and the macro-flexible model. The seismic fragility analysis is able to, in a probability sense, to describe the seismic performance of reinforced concrete frame structures, and provide theoretical foundation and technological support when handling beam-column joints. Therefore, by adopting the duel-frequency control method to select the ground motion record, and by defining four different damage states to investigate the performance level, the seismic fragility analysis was conducted with the incremental dynamic analysis method on OpenSees to obtain the exceedance probability for three reinforced concrete frames with different numbers of stories. The results suggest the seismic performance evaluation with the rigid joint assumption is applicable when the structure is designed abide by the national seismic design code and is subjected to frequent earthquakes. Otherwise, the seismic performance evaluation for reinforced concrete frames should consider the deformation of beam-column joints.
出处
《工程力学》
EI
CSCD
北大核心
2015年第9期183-190,199,共9页
Engineering Mechanics
基金
国家自然科学基金青年基金项目(51408092)
重庆市科技计划项目(catc2014jcyj A30004)
关键词
梁柱节点模型
钢筋混凝土框架
地震易损性
增量动力分析
概率密度分布
性能水平
beam-column joint model
reinforced concrete frame
seismic fragility
incremental dynamic analysis
probability density distribution
performance level
